Create RDD that offers Table based access against SQL backends

[RobertvanderHulst]

This RDD should allow:

• Simple Tablename (the RDD will construct the SELECT statement)
• Normal SQL Select statement Using call back mechanism the RDD will ask the client for more information. Callbacks will happen at the database level and at the connection level. This will be structure much like how it works in the Vo2Ado RDD class. Some properties the Callback function can override:
• Columnlist (defaults to *)
• Maximum number of records to return
• Name of the record number column
• Name of the column that holds the deleted flag
• Should a column be updatable For some of these values (like max # of records and names of recno and deleted column) global values can be specified that can be overruled a the table/query level